Descripción: “...Even if highly praised by his contemporaneous, Montenegro is a relatively less known figure in the Brazilian historiography –except by the more classical studies–, despite his many contributions to technological adoption, contractual innovations in Brazilian labor markets, and active participation in benefit associations. ...”

Descripción: “...ABSTRACTThe article aims to approach the concept of Latin American identity, taking as a reference to Zapata Olivella brothers, Manuel and Delia who resorted to their roots and origins in the traditions of people of African descent in our country, the same way Delia Zapata Olivella’s contributions as artist, dancer, researcher and her greatest gift, teaching for which consolidated a degree in Dance and Theatre at the Universidad Antonio Nariño with the actress and playwright Rosario Mountain Cuellar accompaniment, who would focus their study in the folk traditions of the country, a legacy to the intangible heritage of Colombia. ...”

Descripción: “...A discrete time mathematical model was formulated and a simulation was performed, showing as a result a periodical oscillatory behavior for the evolution of the variables. Some of the main contributions of this study are related to: analyzing the effect of exogenous variables on the behavior of the level variables; proposing a control of the number of cattle older than one year based on the sale of female calves; and developing a discrete time mathematical model using the chain method with delayed fluxes. ...”